| Electronics > Beginners |
| Please help with switch selection |
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| ArthurDent:
Let us not forget that he will, as he said, have 'warning signs' posted to alert everyone that this is a completely unsafe idiotic idea that could result in injury or death. He also said:"I just didn't get all technical cause I was just just looking for a certain switch." Charging lead acid batteries this way without a voltage limit other than line voltage shows a total lack of understanding of the technology or chemistry involved. The voltage should be capped to float at around 13.8 vdc for a '12' volt battery to prevent overcharging. He says: "Its a battery rejuvenator / desulfator". Most lead acid battery cells fail open circuit and won't take a charge. Using this scheme you could have line voltage across an open cell and internal arcing between plates could occur. Maybe he should use this method instead. :palm: |
| soldar:
Without entering into the particular use or safety aspects, this is the kind of thing that could be fabricated with some mechanical tools. Some PCB with the correct tracks, some wipers, a shaft, etc. It should not be terribly difficult. It can also be done easily with relays and some circuitry. Even all solid state. Not difficult. Anecdote: I had just moved into my new house and had few tools or components with me. The car battery died. I forget why, maybe i left the lights on. I had no PSU or charger. Somehow I found four 1N4007 diodes. I took an extension cord out to the yard where the car was parked on the wet grass. I connected the neutral to the frame of the car. Using one diode each I connected several lamps to the positive of the battery. I seem to remember I wasn't getting more than about 3 A all together but after a few hours of charging like that I did manage to start the car. The lamps, diodes, cables and bodged connections were obviously dangerous and I put a note and told all my housemates to not touch anything. Even with no note it was quite obvious that it was best to stay away. The battery was charged without any housemates being electrocuted. |
| shanezampire:
In the video of the battery exploding above... what was the thing on top the battery with the wires running from across the back of the desk to it? Did they just pull the wool over our eyes and fake a hydrogen explosion on us? I am making something very similar to that > |
| ArthurDent:
shanezampire, The video you posted only verifies what posters have been saying about how technically flawed and very dangerous your charging circuit is. Just because it can be posted on YouTube doesn’t mean it is close to being correct and I’d put this video in about the same class as the flat earthers and perpetual energy scams. It is somewhat amusing that you insinuate that the exploding battery video is faked (even though I and many others have seen it happen), but you are willing to swallow everything in the video you posted as fact and reasonable even though it isn’t based on fact or reason. You should read and understand the lead-acid battery charging information in the link below. You should also listen to the warning everyone is giving you on how very dangerous your plan is. https://batteryuniversity.com/learn/article/charging_the_lead_acid_battery |
| Gyro:
--- Quote from: shanezampire on June 17, 2019, 05:13:56 pm ---In the video of the battery exploding above... what was the thing on top the battery with the wires running from across the back of the desk to it? Did they just pull the wool over our eyes and fake a hydrogen explosion on us? --- End quote --- The OP obviously isn't going to learn from the collective knowledge, advice and warnings. Sometimes sacrifices are necessary in order to provide continued proof that Darwin was right, even in the OP's location. :palm: |
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